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Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 26, 2015 | Dec. 31, 2016 | Dec. 26, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance, common stock, shares |  |  |  | 8,927,989 |
Beginning balance |  |  |  | $ 353,226,000 |
Stock option exercises, amount |  |  |  | 866,000 |
Stock-based compensation |  |  |  | 1,743,000 |
Net income |  | $ 12,283,000 | $ 8,098,000 | 27,067,000 | $ 21,553,000
Other comprehensive loss | [1] |  |  | $ 1,077,000 |
Ending balance, common stock, shares |  | 8,992,968 |  | 8,992,968 |
Ending balance |  | $ 383,979,000 |  | $ 383,979,000 |
Pre-tax unrealized loss on available-for-sale investments |  |  |  | $ 1,720,000 |
Common Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance, common stock, shares |  |  |  | 8,927,989 |
Beginning balance |  |  |  | $ 89,000 |
Stock option exercises, shares |  |  |  | 64,979 |
Stock option exercises, amount |  |  |  | $ 1,000 |
Stock-based compensation |  |  |  | 0 |
Net income |  |  |  | 0 |
Other comprehensive loss |  |  |  | $ 0 |
Ending balance, common stock, shares |  | 8,992,968 |  | 8,992,968 |
Ending balance |  | $ 90,000 |  | $ 90,000 |
Additional paid-in capital |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | 241,662,000 |
Stock option exercises, amount |  |  |  | 865,000 |
Stock-based compensation |  |  |  | 1,743,000 |
Net income |  |  |  | 0 |
Other comprehensive loss |  |  |  | 0 |
Ending balance |  | 244,270,000 |  | 244,270,000 |
Retained earnings |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | 110,186,000 |
Stock option exercises, amount |  |  |  | 0 |
Stock-based compensation |  |  |  | 0 |
Net income |  |  |  | 27,067,000 |
Other comprehensive loss |  |  |  | 0 |
Ending balance |  | 137,253,000 |  | 137,253,000 |
Accumulated other comprehensive income |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning balance |  |  |  | 1,289,000 |
Stock option exercises, amount |  |  |  | 0 |
Stock-based compensation |  |  |  | 0 |
Net income |  |  |  | 0 |
Other comprehensive loss | [1] |  |  | 1,077,000 |
Ending balance |  | $ 2,366,000 |  | $ 2,366,000 |
[1] | Other comprehensive income is comprised of unrealized gains and losses on available-for-sale investments. Unrealized gains before tax effect on available-for-sale securities were $1.7 million for the nine months ended December 31, 2016.

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